[Phosphorus intake and balance in winter and spring wheat]
2003
Vucans, R. | Livmanis, J. | Dorbe, A. (Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Soil Science and Agrochemistry)
The impact of mineral fertilizers on P intake and balance in winter and spring wheat was studied on experimental farm "Peterlauki" of the Faculty of Agriculture, Latvia University of Agriculture. The experiments were carried out on sod-pseudogley sandy clay loam soil in 1999-2001. Potassium fertilizer rate K90 was constant over the entire experiment, but phosphorus rates were as follows: P0, P60, P90 and P120 for winter wheat, and P0, P45, P60, P90 for spring wheat. Two different nitrogen levels N60 and N120 for winter wheat, and N60 and N90 for spring wheat were used. Meteorological conditions during the experimental years were quite different. The experiment showed that P content in the grain of winter wheat changed depending on fertilizer rate and meteorological conditions. More significant P changes were observed at a lower nitrogen rate (N60). Growing fertilizers rates for winter increased N utilization coefficient from 0.64 to 0.93 at N60K90, but at N120K90 - from 0.59 to 0.63. In spring wheat, growing P fertilizer rates increased N utilization coefficient from 0.52 to 0.56 at N60K60, but at N90K60 - from 0.47 to 0.49. All P fertilizer rates applied in winter wheat and spring wheat provided a positive total P balance.
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